Twyer peek-hole



E. DATKA.

TWYER PEEK HOLE.

APPLICATION F|LED4MAR.26.1920.

Patented Nov. 23, 1920.

WITNESSES. -V IVY OR m.6.% BY

,Jfifl ATTORNEY UNITED STATES EMRYK DATKA, or DULUTH, ninnnsorn.

TWYER PEEK-HOLE.

Specification of Letters Patent.

Patented Nov. 23, 1920.

Application filed March 26, 1920. Serial No. 368,951.

To all whom it nmg concern:

Be it known that I, EMRYK Dn'rna, a citizen of the United States,residing at Duluth, in the county of St. Louis and State of Minnesota,have invented certain new jacent the sight or peelr hole, beingdestroyed by the heat of the furnace.

The principal object of the invention is to provide such means which maybe readily applied to twyers now in use with as little inconvenience aspossible.

fither objects and advantages of the peculiar construction will appearas the description thereof proceeds.

In the accompanying drawing forming part of this application and inwhich like reference characters indicate like parts:

Figure 1 is side elevation of a common twyer elbow of a furnaceshownpartly in section, and

Fig. 2 is a front elevation of the peek hole cap or cover common to suchtwyer elbows.

1 represents the elbow, and 2 the reduced horizontal extensionthereupon, through which the interior of the furnace is viewed throughthe peek hole in the cover or cap 3, which is removably applied thereto.In practice common to such devices the cap 3, which is of metal, isapplied directly to the end of the extension 2 and securely heldthereupon by suitable bolts and links, not

washer made of heat resisting substance such as carbon of av compositionsimilar to that used in arc lamps and for electric motor brushes, or thelike, the washer portion. being shown at 7 and the bushing portion shownat 8. The bushing or central cylindrical portion 8 extends forwardlythrough the cap 3 and preferably somewhat beyond the outer face ofsameas shown in Fig. 1.

Asan additional feature of the invention I provide a bushing 9 whichsnugly fits within the extension 2 and forms a complete heat resistinglining therefor, the outer end of said bushing being flush with theouter end of the pipe 2, so that the washer portion 7 of the washer andbushing engaged with thecap will contact same, The bushing 9 ispreferably of the same material. as the washer and bushing.

It is well known by those versed in the art that one of the principaldifliculties as sociated with a peel: hole of this character is theburning out and destruction of the cap 3 as well as at times thedestruction of the extension 2, the prevention of which I havesuccessfully accomplished by the installation of the heat resistingmembers above described and the application and forms of which may bevaried considerably from that illustrated, without departing from thespirit of the invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. The combination with a twyer peek hole of the character described andcap therefor, of a heat resisting lining within the peek hole andextending entirely through the cap, for the purpose described.

2. The combination with a twyer elbow extension and peek hole captherefor, of a fireproof member installed intermediate of the extensionand. the cap and extending centrally through the latter, there being anaxially disposed peek hole through the member, substantially as and forthe purpose described.

3. The combination with a twyer elbow extension and peek hole captherefor, of a fire-proof bushing within the extension and a fire-proofwasher intermediate of the cap and the extension whereby to preventexcessive heat contacting the walls of the bushing or the peek hole cap.

4. The combination with a twyer peek hole cap or cover, of a combinedfire-proof bushing and washer installed intermediate of the cap and thetwyer and extending out- Wardly centrally and beyond the cap for directengagement with the glass sight c0111- 111011 to such devices.

In testimony whereof I hereunto ailix my signature in the presence oftwo witnesses. EMRYK DATKA. Witnesses ELLEN Tiinoiun S. GEO. STEVENS.

